/*
 * Copyright 2012 LinkedIn Corp.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */

$.namespace('azkaban');

$(function() {

	var border = 20;
	var header = 30;
	var minTimeWidth = 80;
	var timeWidth = minTimeWidth;
	var lineHeight = 40;
	var numDays = 7;
	var today = new Date();
	var totalHeight = (border * 2 + header + 24 * lineHeight);
	var monthConst = ["January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"];
	var dayOfWeekConst = ["Sunday","Monday","Tuesday","Wednesday","Thursday","Friday","Saturday","Sunday"];
	var hourMillisConst = 3600 * 1000;
	var dayMillisConst = 24 * hourMillisConst;

	$("#svgDivCustom").svg({onLoad:
		function (svg) {

			var totalWidth = $("#svgDivCustom").width();

			$("#svgDivCustom").find("svg").eq(0).removeAttr("width");


			//Outer g
			var gMain = svg.group({transform: "translate(" + border + ".5," + border + ".5)", stroke : "#999", strokeWidth: 1});
			var defaultDate = new Date(today.setDate(today.getDate() - today.getDay()));
			today = new Date();
			var svgDate = defaultDate;

			//Load the date from the hash if existing
			if(window.location.hash) {
				try {
					var dateParts = window.location.hash.replace("#", "").split("-");
					var newDate = new Date(parseInt(dateParts[0]), parseInt(dateParts[1]) - 1, parseInt(dateParts[2]));
					if(!isNaN(newDate)) {
						svgDate = newDate;
					}
				}
				catch(err){ }
			}

			//Used to filter projects or flows out
			var filterProject = new Array();
			var filterFlow = new Array();

			$(".nav-prev-week").click(function (event) {
				svgDate = new Date(svgDate.valueOf() - 7 * dayMillisConst);
				window.location.hash = "#" + svgDate.getFullYear() + "-" + (svgDate.getMonth() + 1) + "-" + svgDate.getDate();
				loadSvg(svgDate);
				event.stopPropagation();
			});
			$(".nav-next-week").click(function (event) {
				svgDate = new Date(svgDate.valueOf() + 7 * dayMillisConst);
				window.location.hash = "#" + svgDate.getFullYear() + "-" + (svgDate.getMonth() + 1) + "-" + svgDate.getDate();
				loadSvg(svgDate);
				event.stopPropagation();
			});
			$(".nav-this-week").click(function (event) {
				svgDate = defaultDate;
				window.location.hash = "#" + svgDate.getFullYear() + "-" + (svgDate.getMonth() + 1) + "-" + svgDate.getDate();
				loadSvg(svgDate);
				event.stopPropagation();
			});



			loadSvg(svgDate);

			function loadSvg(firstDay)
			{
				//Text to show which month/year it is
				var monthIndicatorText = monthConst[firstDay.getMonth()] + " " + firstDay.getFullYear().toString();
				//Measure a good width for the text to display well
				timeWidth = Math.max(minTimeWidth, measureText(svg, monthIndicatorText, {fontSize: "20", style: "text-anchor: end;"}));

				var dayWidth = Math.floor((totalWidth - 3 * border - timeWidth) / numDays);

				//svg.configure({viewBox: "0 0 " + totalWidth + " " + totalHeight, style: "width:100%"}, true);
				svg.remove(gMain);
				gMain = svg.group({transform: "translate(" + border + ".5," + border + ".5)", stroke : "#999", strokeWidth: 1});
				svg.text(gMain, timeWidth, header - 8, monthIndicatorText, {fontSize: "20", style: "text-anchor: end;", fill : "#F60", stroke : "none"});
				//time indicator group
				var gLeft = svg.group(gMain, {transform: "translate(0," + header + ")"});
				//Draw lines and hours
				for(var i = 0; i < 24; i++)
				{
					svg.line(gLeft, 0, i * lineHeight, timeWidth, i * lineHeight);
					//Gets the hour text from an integer from 0 to 23
					var hourText = getHourText(i);
					//Move text down a bit? TODO: Is there a CSS option for top anchor?
					svg.text(gLeft, timeWidth, i * lineHeight + 15, hourText, {fontSize: "14", style: "text-anchor: end;", fill : "#333", stroke : "none"});
				}

				//var firstDay = new Date();//(new Date()).valueOf();
				firstDay = new Date(firstDay.getFullYear(), firstDay.getMonth(), firstDay.getDate()).valueOf();
				var isThisWeek = -1;
				//Draw background
				for(var deltaDay = 0; deltaDay < numDays; deltaDay++)
				{
					//Day group
					var gDay = svg.group(gMain, {transform: "translate(" + (border + timeWidth + deltaDay * dayWidth) + "," + header + ")"});

					//This is temporary.
					var date = new Date(firstDay + dayMillisConst * deltaDay);
					var day = date.getDate();

					//Draw box around
					var isToday = date.getFullYear() == today.getFullYear() && date.getMonth() == today.getMonth() && date.getDate() == today.getDate();
					if(isToday)
					{
						isThisWeek = deltaDay;
					}
					svg.rect(gDay, 0, -header, dayWidth, 24 * lineHeight + header, {fill : "none", stroke : "#F60"});
					//Draw day title
					svg.text(gDay, 6, -8, day + " " + dayOfWeekConst[date.getDay()], {fontSize: "20", fill : isToday?"#06C":"#F60", stroke : "none"});

					//Draw horizontal lines
					for(var i = 0; i < 24; i++)
					{
						svg.line(gDay, 0, i * lineHeight, dayWidth, i * lineHeight);
					}
				}

				var gDayViewOuterGroup = svg.group(gMain);
				var gDayView = svg.group(gDayViewOuterGroup, {transform: "translate(" + (border + timeWidth) + "," + header + ")"});
				if(isThisWeek != -1)
				{
					var date = new Date(firstDay + dayMillisConst * isThisWeek);
					var day = date.getDate();
					var gDay = svg.group(gMain, {transform: "translate(" + (border + timeWidth + isThisWeek * dayWidth) + "," + header + ")"});
					svg.rect(gDay, 0, -header, dayWidth, 24 * lineHeight + header, {fill : "none", stroke : "#06F"});
					var lineY = Math.floor(today.getHours() * lineHeight + today.getMinutes() * lineHeight / 60);
					svg.line(gDay, 0, lineY, dayWidth, lineY, {fill : "none", stroke : "#06F", strokeWidth : 4});
				}

				//A list of all items
				var itemByDay = new Array();
				for(var deltaDay = 0; deltaDay < numDays; deltaDay++) {
					itemByDay[deltaDay] = new Array();
				}

				var itemByScheduleIdMap = {};

				function filterApplies(item) {
					for(var i = 0; i < filterProject.length; i++) {
						if(item.projectname == filterProject[i].projectname) {
							return true;
						}
					}
					for(var i = 0; i < filterFlow.length; i++) {
						if(item.projectname == filterFlow[i].projectname && item.flowname == filterFlow[i].flowname) {
							return true;
						}
					}
					return false;
				}

				//Function that re-renders all loaded items
				function renderDays() {
					//Clear items inside the day view
					svg.remove(gDayView);
					gDayView = svg.group(gDayViewOuterGroup, {transform: "translate(" + (border + timeWidth) + "," + header + ")"});

					//Add day groups
					for(var deltaDay = 0; deltaDay < numDays; deltaDay++) {
						var gDay = svg.group(gDayView, {transform: "translate(" + (deltaDay * dayWidth) + ")"});
						var data = itemByDay[deltaDay];
						//Sort the arrays to have a better view
						data.sort(function (a, b){
							//Smaller time in front
							var timeDiff = a.time - b.time;
							if(timeDiff == 0) {
								//Larger length in front
								var lengthDiff = b.length - a.length;
								if(lengthDiff == 0) {
									//Sort by alphabetical
									return (a.flowname < b.flowname ? 1 : a.flowname > b.flowname ? -1 : 0);
								}
								return lengthDiff;
							}
							return timeDiff;
						});
						//Sort items to columns
						var columns = new Array();
						columns.push(new Array());
						//Every item is parsed through here into columns
						for(var i = 0; i < data.length; i++) {
							//Apply filters here
							if(filterApplies(data[i])) {
								continue;
							}

							var foundColumn = false;
							//Go through every column until a place can be found
							for(var j = 0; j < columns.length; j++) {
								if(!intersectArray(data[i], columns[j])) {
									//Found a place
									columns[j].push(data[i]);
									foundColumn = true;
									break;
								}
							}
							//No place, create new column
							if(!foundColumn) {
								columns.push(new Array());
								columns[columns.length - 1].push(data[i]);
							}
						}

						//Actually drawing them
						for(var i = 0; i < columns.length; i++) {
							//Split into columns
							var gColumn = svg.group(gDay, {transform: "translate(" + Math.floor(i * dayWidth / columns.length) + ")", style: "opacity: 0.8"});
							for(var j = 0; j < columns[i].length; j++) {
								//Draw item
								var item = columns[i][j];
								var startTime = new Date(item.time);
								var startY = Math.floor(startTime.getHours() * lineHeight + startTime.getMinutes() * lineHeight / 60);
								var endTime = new Date(item.time + item.length );
								var endY = Math.ceil(startY + (item.length * lineHeight) / hourMillisConst);
								var deltaY = Math.ceil(endY - startY);
								if(deltaY < 5){
									deltaY = 5;
								}
								//var anchor = svg.a(gColumn);
								var itemUrl = contextURL + "/manager?project=" + item.projectname + "&flow=" + item.flowname;
								var gItem = svg.link(gColumn, itemUrl, {transform: "translate(0," + startY + ")"});

								//Pass the item into the DOM data store to be retrieved later on
								$(gItem).data("item", item);

								//Replace the context handler
								gItem.addEventListener('contextmenu', handleContextMenu);

								//Add a tooltip on mouse over
								gItem.addEventListener('mouseover', handleMouseOver);
								//Remove the tooltip on mouse out
								gItem.addEventListener('mouseout', handleMouseOut);

								//$(gItem).attr("style","color:red");
								var rect = svg.rect(gItem, 0, 0, Math.ceil(dayWidth / columns.length), deltaY, 0, 0, {fill : item.item.color, stroke : "#444", strokeWidth : 1});
								
								item.rect = rect;
								//Draw text
								//svg.text(gItem, 6, 16, item.flowname, {fontSize: "13", fill : "#000", stroke : "none"});
							}
						}
					}
				}

				function processItem(item, scheduled)
				{
					var firstTime = item.time;
					var startTime = firstDay;
					var endTime = firstDay + numDays * dayMillisConst;
					var period = item.period;
					var restrictedStartTime = Math.max(firstDay, today.valueOf());
					if(!scheduled){
						restrictedStartTime = firstDay;
					}

					// Shift time until we're past the start time
					if (period > 0) {
						// Calculate next execution time efficiently
						// Take into account items that ends in the date specified, but does not start on that date
						var periods = Math.floor((restrictedStartTime - (firstTime)) / period);
						//Make sure we don't subtract
						if(periods < 0){
							periods = 0;
						}
						firstTime += period * periods;
						// Increment in case we haven't arrived yet. This will apply to most of the cases
						while (firstTime < restrictedStartTime) {
							firstTime += period;
						}
					}

					// Bad or no period
					if (period <= 0) {
						// Single instance case
						if (firstTime >= restrictedStartTime && firstTime < endTime) {
							addItem({scheduleid: item.scheduleid, flowname : item.flowname, projectname: item.projectname, time: firstTime, length: item.length, item: item});
						}
					}
					else {
						if(period <= hourMillisConst) {
							addItem({scheduleid: item.scheduleid, flowname : item.flowname, projectname: item.projectname, time: firstTime, length: endTime - firstTime, item: item});
						}
						else{
							// Repetitive schedule, firstTime is assumed to be after startTime
							while (firstTime < endTime) {
								addItem({scheduleid: item.scheduleid, flowname : item.flowname, projectname: item.projectname, time: firstTime, length: item.length, item: item});
								firstTime += period;
							}
						}
					}
				}

				function addItem(obj)
				{
					var itemStartTime = new Date(obj.time);
					var itemEndTime = new Date(obj.time + obj.length);
					var itemStartDate = new Date(itemStartTime.getFullYear(), itemStartTime.getMonth(), itemStartTime.getDate());
					var itemEndDate = new Date(itemEndTime.getFullYear(), itemEndTime.getMonth(), itemEndTime.getDate());

					//Cross date item, cut it to only today's portion and add another item starting tomorrow morning
					if(itemStartDate.valueOf() != itemEndDate.valueOf() && itemEndTime.valueOf() != itemStartDate + dayMillisConst)
					{
						var nextMorning = itemStartDate.valueOf() + dayMillisConst;
						var excess = obj.length - (nextMorning - itemStartTime.valueOf());
						obj.length = nextMorning - itemStartTime.valueOf();
						while(excess > 0)
						{
							var tempLength = excess;
							if(tempLength > dayMillisConst){
								tempLength = dayMillisConst;
							}

							var item2 = {scheduleid: obj.scheduleid, time: nextMorning, length: tempLength, projectname: obj.projectname, flowname: obj.flowname, item: obj.item};
							addItem(item2);
							excess -= tempLength;
							nextMorning += dayMillisConst;
						}
					}

					//Now the item should be only in one day
					var index = (itemStartDate.valueOf() - firstDay) / dayMillisConst;
					if(index >= 0 && index < numDays)
					{
						//Add the item to the rendering list
						itemByDay[index].push(obj);
						//obj.item.objs.push(obj);

						if(!itemByScheduleIdMap[obj.scheduleid]){
							itemByScheduleIdMap[obj.scheduleid] = new Array();
						}
						itemByScheduleIdMap[obj.scheduleid].push(obj);
					}
				}

				function handleContextMenu(event) {
					var requestURL = $(this).attr("href");
					var item = $(this).data("item");
					var menu = [
						{title: "Job \"" + item.flowname + "\" From Project \"" + item.projectname + "\""},
						{title: "View Job", callback: function() {window.location.href=requestURL;}},
						{title: "View Job in New Window", callback: function() {window.open(requestURL);}},
						{title: "Hide Job", callback: function() {filterFlow.push(item); renderDays();}},
						{title: "Hide All Jobs From the Same Project", callback: function() {filterProject.push(item); renderDays();}}
					];
					contextMenuView.show(event, menu);
					event.preventDefault();
					event.stopPropagation();
					return false;
				}

				function handleMouseOver(event) {
					//Create the new tooltip
					var requestURL = $(this).attr("href");
					var obj = $(this).data("item");
					var offset = $("svg").offset();
					var thisOffset = $(this).offset();

					var tooltip = svg.group({transform: "translate(" + (thisOffset.left - offset.left + 2) + "," + (thisOffset.top - offset.top - 2) + ")"});
					var text = [
						"\"" + obj.flowname + "\" from \"" + obj.projectname + "\"",
						"Repeat: " + formatReadablePeriod(obj.item.period)
					];

					if(obj.item.period == 0){
						text[1] = "";
						if(obj.item.history == true) {
							if(obj.item.status == 50){
								text[1] = "SUCCEEDED";
							}
							else if(obj.item.status == 60){
								text[1] = "KILLED";
							}
							else if(obj.item.status == 70){
								text[1] = "FAILED";
							}
							else if(obj.item.status == 80){
								text[1] = "FAILED_FINISHING";
							}
							else if(obj.item.status == 90){
								text[1] = "SKIPPED";
							}
						}
					}
					var textLength = Math.max(measureText(svg, text[0], {fontSize: "13"}), measureText(svg, text[1], {fontSize: "13"}));
					var rect = svg.rect(tooltip, 0, -40, textLength + 4, 40, {fill : "#FFF", stroke : "none"});
					svg.text(tooltip, 2, -25, text[0], {fontSize: "13", fill : "#000", stroke : "none"});
					svg.text(tooltip, 2, -5, text[1], {fontSize: "13", fill : "#000", stroke : "none"});

					//Store tooltip
					$(this).data("tooltip", tooltip);

					if(itemByScheduleIdMap[obj.scheduleid]){
						//Item highlight effect
						var arry = itemByScheduleIdMap[obj.scheduleid];
						for(var i = 0; i < arry.length; i++) {
							$(arry[i].rect).attr("fill", "#FF0");
						}
					}
				}

				function handleMouseOut(event) {
					//Item highlight effect
					var obj = $(this).data("item");
						//Item highlight effect
					if(itemByScheduleIdMap[obj.scheduleid]){
						var arry = itemByScheduleIdMap[obj.scheduleid];
						for(var i = 0; i < arry.length; i++) {
							var obj2 = obj.item.objs[i];
							$(arry[i].rect).attr("fill", arry[i].item.color);
						}
					}
					//Clear the fade interval
					$($(this).data("tooltip")).fadeOut(250, function(){ svg.remove(this); });
				}

				//Asynchronously load data
				var requestURL = contextURL + "/schedule";
				$.ajax({
					type: "GET",
					url: requestURL,
					data: {"ajax": "loadFlow"},
					dataType: "json",
					success: function (data)
					{
						var items = data.items;

						//Sort items by day
						for(var i = 0; i < items.length; i++)
						{
							//items[i].length = hourMillisConst; //TODO: Remove this to get the actual length
							items[i].objs = new Array();
							items[i].color = "#69F";
							processItem(items[i], true);
						}
						//Trigger a re-rendering of all the data
						renderDays();
					}
				});
				for(var deltaDay = 0; deltaDay < numDays; deltaDay++) {
					$.ajax({
						type: "GET",
						url: requestURL,
						data: {"ajax": "loadHistory", "startTime": firstDay + deltaDay * dayMillisConst, "loadAll" : 0},
						//dataType: "json",
						success: function (data)
						{
							var items = data.items;

							//Sort items by day
							for(var i = 0; i < items.length; i++)
							{
								//if(items[i].length < 5 * 60 * 1000) items[i].length = 5 * 60 * 1000;
								items[i].objs = new Array();
								items[i].color = "#7E7";
								if(items[i].status == 60 || items[i].status == 70 || items[i].status == 80)
									items[i].color = "#E77";
								processItem(items[i], false);
							}
							//Trigger a re-rendering of all the data
							renderDays();
						}
					});
				}
			}
		}, settings : {
			"xmlns" : "http://www.w3.org/2000/svg", 
			"xmlns:xlink" : "http://www.w3.org/1999/xlink", 
			"shape-rendering" : "optimize-speed",
			"style" : "width:100%;height:" + totalHeight + "px"
		}});

	function dayMatch(d1, d2) {
		return d1.getDate() == d2.getDate() && d1.getFullYear() == d2.getFullYear() && d1.getMonth() == d2.getMonth();
	}

	function getHourText(hour) {
		return (hour==0 ? "12 AM" : (hour<12 ? hour + " AM" : (hour==12 ? "12 PM" : (hour-12) + " PM" )));
	}

	function intersectArray(a, arry) {
		for(var i = 0; i < arry.length; i++) {
			var b = arry[i];
			if(a.time < b.time + b.length && a.time + a.length > b.time) {
				return true;
			}
		}

		return false;
	}

	function measureText(svg, text, options) {
		var test = svg.text(0, 0, text, options);
		var width = test.getComputedTextLength();
		svg.remove(test);
		return width;
	}

	function formatReadablePeriod(period) {
		var days = Math.floor(period / dayMillisConst);
		var hour = period - days * dayMillisConst;
		var hours = Math.floor(hour / hourMillisConst);
		var min = hour - hours * hourMillisConst;
		var mins = Math.floor(min / 60000);

		var text = "";
		if(days > 0) text = (days == 1 ? "24 hours" : days.toString() + " days");
		if(hours > 0) text = text + " " + (hours == 1 ? "1 hour" : hours.toString() + " hours");
		if(mins > 0) text = text + " " + (mins == 1 ? "1 minute" : mins.toString() + " minutes");
		return text;
	}
});
